保证()安全是管串设计的首要原则。
参考答案:人身
The boy didn't come to ________ life and the method to start his breathing ended up as ________ failure.
A./;the
B.the;/
C.a;a
D./;a
引起艾滋病人鹅口疮的病原体是()
A.巨细胞病毒
B.卡氏肺孢子菌
C.弓形虫
D.念珠菌
E.疱疹病毒